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Q#1 Power System Stability GATE EE 1991 NAT +2 marks -0 marks

A generator is supplying 1 per unit power to an infinite bus through the system shown in figure. Following fault at F, circuit breakers  and  open simultaneously. The  relationships in per unit are given by

Pre-fault condition:

During fault condition:

When  remain closed:

After  open:

Calculate the critical angel  before which breakers

 and  must open so that synchronism is not lost.

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